Rough Idle 2004 Grand Cherokee 4.7L
 

Hope someone can help. Wife has the '04 GC with 4.7L HO AWD. We've
had it to the dealer, (tune up at 40K miles w/platinum plugs) and
still when you first start the car is when it's the worst. Has a rough
idle. When the RPM's are raised it smooths out. Still averaging ~18
MPG...but the rough idle is a nusiance.

Took the car to our local service center. They could find nothing
wrong! Cleaned the throttle body and added a cleaner to the tank.
Still NO good. Wife loves this Jeep!

Hoping someone has lucked into the problem and knows the fix.
Dan in TN

Re: Rough Idle 2004 Grand Cherokee 4.7L
 

On May 20, 7:31 pm, Dano <ybego...@msn.com> wrote:
> Hope someone can help. Wife has the '04 GC with 4.7L HO AWD. We've
> had it to the dealer, (tune up at 40K miles w/platinum plugs) and
> still when you first start the car is when it's the worst. Has a rough
> idle. When the RPM's are raised it smooths out. Still averaging ~18
> MPG...but the rough idle is a nusiance.
>
> Took the car to our local service center. They could find nothing
> wrong! Cleaned the throttle body and added a cleaner to the tank.
> Still NO good. Wife loves this Jeep!
>
> Hoping someone has lucked into the problem and knows the fix.
> Dan in TN

This sounds like idle air control motor. These can get pretty dirty
and cause idle problems, but are easy to clean (30-min job) with some
carb cleaner spray.

See the "Cleaning the throttle body and IAC plunger" section at
http://www.wjjeeps.com/service/tbody.htm

Re: Rough Idle 2004 Grand Cherokee 4.7L
 

On May 20, 7:31 pm, Dano <ybego...@msn.com> wrote:
> Hope someone can help. Wife has the '04 GC with 4.7L HO AWD. We've
> had it to the dealer, (tune up at 40K miles w/platinum plugs) and
> still when you first start the car is when it's the worst. Has a rough
> idle. When the RPM's are raised it smooths out. Still averaging ~18
> MPG...but the rough idle is a nusiance.
>
> Took the car to our local service center. They could find nothing
> wrong! Cleaned the throttle body and added a cleaner to the tank.
> Still NO good. Wife loves this Jeep!
>
> Hoping someone has lucked into the problem and knows the fix.
> Dan in TN

This sounds like idle air control motor. These can get pretty dirty
and cause idle problems, but are easy to clean (30-min job) with some
carb cleaner spray.

See the "Cleaning the throttle body and IAC plunger" section at
http://www.wjjeeps.com/service/tbody.htm

Re: Rough Idle 2004 Grand Cherokee 4.7L
 

On May 20, 7:31 pm, Dano <ybego...@msn.com> wrote:
> Hope someone can help. Wife has the '04 GC with 4.7L HO AWD. We've
> had it to the dealer, (tune up at 40K miles w/platinum plugs) and
> still when you first start the car is when it's the worst. Has a rough
> idle. When the RPM's are raised it smooths out. Still averaging ~18
> MPG...but the rough idle is a nusiance.
>
> Took the car to our local service center. They could find nothing
> wrong! Cleaned the throttle body and added a cleaner to the tank.
> Still NO good. Wife loves this Jeep!
>
> Hoping someone has lucked into the problem and knows the fix.
> Dan in TN

This sounds like idle air control motor. These can get pretty dirty
and cause idle problems, but are easy to clean (30-min job) with some
carb cleaner spray.

See the "Cleaning the throttle body and IAC plunger" section at
http://www.wjjeeps.com/service/tbody.htm

Re: Rough Idle 2004 Grand Cherokee 4.7L
 

On May 20, 7:31 pm, Dano <ybego...@msn.com> wrote:
> Hope someone can help. Wife has the '04 GC with 4.7L HO AWD. We've
> had it to the dealer, (tune up at 40K miles w/platinum plugs) and
> still when you first start the car is when it's the worst. Has a rough
> idle. When the RPM's are raised it smooths out. Still averaging ~18
> MPG...but the rough idle is a nusiance.
>
> Took the car to our local service center. They could find nothing
> wrong! Cleaned the throttle body and added a cleaner to the tank.
> Still NO good. Wife loves this Jeep!
>
> Hoping someone has lucked into the problem and knows the fix.
> Dan in TN

This sounds like idle air control motor. These can get pretty dirty
and cause idle problems, but are easy to clean (30-min job) with some
carb cleaner spray.

See the "Cleaning the throttle body and IAC plunger" section at
http://www.wjjeeps.com/service/tbody.htm

Re: Rough Idle 2004 Grand Cherokee 4.7L
 

i would do a fuel system pressure check and go from there even going as
far as disabling each injector as it runs to see if the idle changes

Dano wrote:

> Hope someone can help. Wife has the '04 GC with 4.7L HO AWD. We've
> had it to the dealer, (tune up at 40K miles w/platinum plugs) and
> still when you first start the car is when it's the worst. Has a rough
> idle. When the RPM's are raised it smooths out. Still averaging ~18
> MPG...but the rough idle is a nusiance.
>
> Took the car to our local service center. They could find nothing
> wrong! Cleaned the throttle body and added a cleaner to the tank.
> Still NO good. Wife loves this Jeep!
>
> Hoping someone has lucked into the problem and knows the fix.
> Dan in TN

Re: Rough Idle 2004 Grand Cherokee 4.7L
 

i would do a fuel system pressure check and go from there even going as
far as disabling each injector as it runs to see if the idle changes

Dano wrote:

> Hope someone can help. Wife has the '04 GC with 4.7L HO AWD. We've
> had it to the dealer, (tune up at 40K miles w/platinum plugs) and
> still when you first start the car is when it's the worst. Has a rough
> idle. When the RPM's are raised it smooths out. Still averaging ~18
> MPG...but the rough idle is a nusiance.
>
> Took the car to our local service center. They could find nothing
> wrong! Cleaned the throttle body and added a cleaner to the tank.
> Still NO good. Wife loves this Jeep!
>
> Hoping someone has lucked into the problem and knows the fix.
> Dan in TN

Re: Rough Idle 2004 Grand Cherokee 4.7L
 

i would do a fuel system pressure check and go from there even going as
far as disabling each injector as it runs to see if the idle changes

Dano wrote:

> Hope someone can help. Wife has the '04 GC with 4.7L HO AWD. We've
> had it to the dealer, (tune up at 40K miles w/platinum plugs) and
> still when you first start the car is when it's the worst. Has a rough
> idle. When the RPM's are raised it smooths out. Still averaging ~18
> MPG...but the rough idle is a nusiance.
>
> Took the car to our local service center. They could find nothing
> wrong! Cleaned the throttle body and added a cleaner to the tank.
> Still NO good. Wife loves this Jeep!
>
> Hoping someone has lucked into the problem and knows the fix.
> Dan in TN

Re: Rough Idle 2004 Grand Cherokee 4.7L
 

i would do a fuel system pressure check and go from there even going as
far as disabling each injector as it runs to see if the idle changes

Dano wrote:

> Hope someone can help. Wife has the '04 GC with 4.7L HO AWD. We've
> had it to the dealer, (tune up at 40K miles w/platinum plugs) and
> still when you first start the car is when it's the worst. Has a rough
> idle. When the RPM's are raised it smooths out. Still averaging ~18
> MPG...but the rough idle is a nusiance.
>
> Took the car to our local service center. They could find nothing
> wrong! Cleaned the throttle body and added a cleaner to the tank.
> Still NO good. Wife loves this Jeep!
>
> Hoping someone has lucked into the problem and knows the fix.
> Dan in TN

Re: Rough Idle 2004 Grand Cherokee 4.7L
 

On May 21, 7:36 am, TakeFlight <erik.j.c...@gmail.com> wrote:
> On May 20, 7:31 pm, Dano <ybego...@msn.com> wrote:
>
> > Hope someone can help. Wife has the '04 GC with 4.7L HO AWD. We've
> > had it to the dealer, (tune up at 40K miles w/platinum plugs) and
> > still when you first start the car is when it's the worst. Has arough
> >idle. When the RPM's are raised it smooths out. Still averaging ~18
> > MPG...but theroughidleis a nusiance.
>
> > Took the car to our local service center. They could find nothing
> > wrong! Cleaned the throttle body and added a cleaner to the tank.
> > Still NO good. Wife loves this Jeep!
>
> > Hoping someone has lucked into the problem and knows the fix.
> > Dan in TN
>
> This sounds likeidleair control motor. These can get pretty dirty
> and causeidleproblems, but are easy to clean (30-min job) with some
> carb cleaner spray.
>
> See the "Cleaning the throttle body and IAC plunger" section athttp://www.wjjeeps.com/service/tbody.htm

I cleaned the IAC plunger on the 04 GR today. Made ALL the difference
in the world! RUNS and IDLES FLAWLESSLY! THANK YOU!!! Quite a bit
of carbon build up and cleaned with carb cleaner.
Thank you again!
Dan in TN